
pub fn capitalize_first_letter(s: &str) -> String {
    let mut chars = s.chars();

    if let Some(first_char) = chars.next() {
        let capitalized_first_char = first_char.to_uppercase();
        let remaining_chars: String = chars.collect();
        return format!("{}{}", capitalized_first_char, remaining_chars);
    }

    s.to_string()
}
